The influences of aging on the structure and properties of quartz fiber and its polyimide composites (QW280/AC721) were studied by the artificial accelerated thermal-oxidative aging experiments. The results show that after aging at 300 ℃ for 150 h, the tensile strength of quartz fiber is significantly reduced with the retention ratio of only 44%, which is ascribed to the oxidation and decomposition of the surface wetting agent of the quartz fiber. However, due to the protective effect of polyimide resin on the fiber, the mechanical properties of the polyimide composites have a high retention rate. After aging at 300 ℃ for 150 h, the modulus of the composites shows no obvious change, the retention ratios of tensile strength at room temperature and at 300 ℃ are above 75% and 91% respectively, and the retention ratios of bending and interlaminar shear strength are both above 85%. The dielectric properties of the composites are stable upon the high temperature treatment. After the thermal-oxidative aging at 300 ℃ for different time periods (0-150 h), the dielectric constant in the frequency band of 7-18 GHz remains in the range of 3.5-3.8, and the dielectric loss tangent is lower than 5×10−3.
High-temperature thermal oxidative aging properties of quartz fiber reinforced polyimide composites
2022
Article (Journal)
Electronic Resource
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